The moon is made of cheese shops

So this morning, when Alex came in to our bedroom to have a cuddle and tell stories and sing songs (he frequently provides us with this joyous entertainment on the weekend - luckily today it was nearly 8am) the theme was rockets, space travel and so on. At one point, Alex tells me we are all on the moon, and then he says "and now I got some cheese". Sleepily, I say "is the moon made of cheese, then?". "No," he says, "there's a cheese shop". So there you have it.